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參數(shù)資料
| 型號(hào)： | IRU431LCL5 |
| 廠(chǎng)商： | International Rectifier |
| 英文描述： | LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR |
| 中文描述： | 低電壓調(diào)節(jié)精密并聯(lián)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 47K |
| 代理商： | IRU431LCL5 |
IRU431L / IRU431AL
5
Rev. 1.8
02/20/02
www.irf.com
Thermal Design
The IRU431L is offered in the surface mount SOT-23 (L)
packages. The SOT-23 package has the maximum power
dissipation capability of 150mW at T
A
=25
°
C with the de-
rating factor of -1.2mW /
°
C.
The table below summarizes the maximum power dissi-
pation capability of each package versus ambient tem-
perature.
Ambient Temperature (T
A
) -
8
C
Pkg 25 40 50 60 70
SOT-23
150mW
132mW
120mW
108mW
96mW
In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation:
V
MAX
- V
KA
R
B
As shown in the power dissipation table, both packages
can handle this power dissipation.
P
MAX
= V
KA
×
o
p
Where:
P
MAX
= Maximum power dissipation of the 431L
For our example:
P
MAX
= 3.3
×
o
p
= 89mW
6 - 3.3
100
Stability
The IRU431L has many different domains of stability as
a function of the cathode current. As is typical of three-
terminal shunt regulators, the IRU431L has many do-
mains of stability. The actual domain in which any prac-
tical circuit operates is related to cathode current. In
general the device will be unconditionally stable for any
cathode current if a capacitor, 1
μ
F or larger, is connected
between the cathode and the anode. If the cathode cur-
rent is always higher than 3mA under minimum line and
maximum load conditions, the capacitor value can be
reduced to 0.01
μ
F and the system will be stable.
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